package com.example.netty;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;

/**
 * TODO: 这里要写注释的!
 */
public class EchoClient {

    public static void main(String[] args) {
        new EchoClient().connect(8080,"127.0.0.1");
    }
    public void connect(int port,String host){
        EventLoopGroup group= new NioEventLoopGroup();
        try{
            Bootstrap b= new Bootstrap();
            b.group(group)
                    .channel(NioSocketChannel.class)
                    .option(ChannelOption.TCP_NODELAY,true)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override protected void initChannel(SocketChannel socketChannel) throws Exception {
                            ByteBuf byteBuf= Unpooled.copiedBuffer("$_".getBytes());
                            socketChannel.pipeline().addLast(new DelimiterBasedFrameDecoder(1024,byteBuf));
                            socketChannel.pipeline().addLast(new StringDecoder());
                            socketChannel.pipeline().addLast(new EchoClientHandler());
                        }
                    });
            ChannelFuture future= b.connect(host,port).sync();
            future.channel().closeFuture().sync();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            group.shutdownGracefully();
        }
    }
}
